Negative isotope effect of a BCS-like gap; an inelastic light scattering study
| dc.creator | Yang, In-Sang | |
| dc.creator | Klein, M. V. | |
| dc.creator | Bud'ko, S. | |
| dc.creator | Canfield, P. C. | |
| dc.date | 2002-02-08 | |
| dc.date.accessioned | 2026-07-07T02:44:22Z | |
| dc.date.available | 2026-07-07T02:44:22Z | |
| dc.description | In a prior study of the boron isotope effect on the transition temperature ($T_c$) of $R$Ni$_2$B$_2$C ($R$ = Y, Lu) system, a positive isotope effect was observed, e.g., $T_{c}(^{10}B)> T_{c}(^{11}B)$. BCS theory predicts that the superconducting gap at zero temperature ($Δ_0$) is proportional to $T_c$. Therefore, the gap should also show a positive boron isotope effect. On the contrary, in an inelastic light scattering study, we report a negative boron isotope effect on the energy $Ω$ of the gap-like feature in B$_{2g}$ symmetry, e.g., $Ω(^{10}B)< Ω(^{11}B)$. The origin of the effect is discussed in terms of selective probing of a non-conventional electron-phonon interaction on part of the Fermi surface, probably near the X point in the Brillouin zone. | |
| dc.description | 4 pages, 4 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0202134 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0202134 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/18890 | |
| dc.subject | Superconductivity | |
| dc.title | Negative isotope effect of a BCS-like gap; an inelastic light scattering study | |
| dc.type | text |